forked from bartvdbraak/blender
120 lines
4.0 KiB
C++
120 lines
4.0 KiB
C++
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor(s): Porteries Tristan.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file gameengine/Expressions/KX_PythonCallBack.cpp
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* \ingroup expressions
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*/
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#include "KX_PythonCallBack.h"
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#include <iostream>
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#include <stdarg.h>
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#include "BLI_alloca.h"
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/** Check if a python value is a function and have the correct number of arguments.
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* \param value The python value to check.
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* \param minargcount The minimum of arguments possible.
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* \param maxargcount The maximum of arguments possible.
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* \param r_argcount The number of argument of this function, this variable will be
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* changed in the function.
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*/
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static PyObject *CheckPythonFunction(PyObject *value, unsigned int minargcount, unsigned int maxargcount, unsigned int &r_argcount)
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{
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if (PyMethod_Check(value)) {
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PyCodeObject *code = ((PyCodeObject *)PyFunction_GET_CODE(PyMethod_GET_FUNCTION(value)));
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// *args support
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r_argcount = (code->co_flags & CO_VARARGS) ? maxargcount : (code->co_argcount - 1);
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}
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else if (PyFunction_Check(value)) {
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PyCodeObject *code = ((PyCodeObject *)PyFunction_GET_CODE(value));
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// *args support
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r_argcount = (code->co_flags & CO_VARARGS) ? maxargcount : code->co_argcount;
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}
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else { // is not a methode or a function
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PyErr_Format(PyExc_TypeError, "items must be functions or methodes, not %s",
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Py_TYPE(value)->tp_name);
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return NULL;
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}
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if (r_argcount < minargcount || r_argcount > maxargcount) {
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// wrong number of arguments
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PyErr_Format(PyExc_TypeError, "methode or function (%s) has invalid number of arguments (%i) must be between %i and %i",
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Py_TYPE(value)->tp_name, r_argcount, minargcount, maxargcount);
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return NULL;
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}
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return value;
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}
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/** Create a python tuple to call a python function
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* \param argcount The lenght of the tuple.
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* \param arglist The fully list of python arguments [size >= argcount].
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*/
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static PyObject *CreatePythonTuple(unsigned int argcount, PyObject **arglist)
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{
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PyObject *tuple = PyTuple_New(argcount);
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for (unsigned int i = 0; i < argcount; ++i) {
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PyObject *item = arglist[i];
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// increment reference and copy it in a new tuple
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Py_INCREF(item);
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PyTuple_SET_ITEM(tuple, i, item);
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}
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return tuple;
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}
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void RunPythonCallBackList(PyObject *functionlist, PyObject **arglist, unsigned int minargcount, unsigned int maxargcount)
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{
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unsigned int size = PyList_Size(functionlist);
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PyObject **argTuples = (PyObject **)BLI_array_alloca(argTuples, maxargcount - minargcount + 1);
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memset(argTuples, 0, sizeof(PyObject *) * (maxargcount - minargcount + 1));
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for (unsigned int i = 0; i < size; ++i) {
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unsigned int funcargcount = 0;
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PyObject *item = PyList_GET_ITEM(functionlist, i);
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PyObject *func = CheckPythonFunction(item, minargcount, maxargcount, funcargcount);
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if (!func) { // this item fails the check
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PyErr_Print();
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PyErr_Clear();
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continue;
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}
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// get correct argument tuple.
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PyObject *tuple = argTuples[funcargcount - minargcount];
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if (!tuple)
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argTuples[funcargcount - minargcount] = tuple = CreatePythonTuple(funcargcount, arglist);
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PyObject *ret = PyObject_Call(func, tuple, NULL);
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if (!ret) { // if ret is NULL this seems that the function doesn't work !
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PyErr_Print();
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PyErr_Clear();
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}
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else
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Py_DECREF(ret);
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}
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for (unsigned int i = 0; i <= (maxargcount - minargcount); ++i)
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Py_XDECREF(argTuples[i]);
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}
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